Polyimide/modified natural melanin nanocomposite and preparation method thereof

A technology of nano-composite materials and natural melanin, which is applied in the field of chemical materials, can solve the problems of poor mechanical properties of composite materials, high-temperature resistance of shielding materials, and shortened shielding life of materials, so as to achieve strong ultraviolet radiation resistance and high ultraviolet shielding efficiency , and other outstanding effects

Active Publication Date: 2017-10-24
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention aims to solve the problem that the matrix in the current common organic / inorganic composite shielding materials is prone to photodegradation; the matrix in the melanin composite shielding material does not have ultraviolet absorption performance, and after the melanin fails, the composite material The shielding performance is completely lost, and the material's The shading life is shortened; the shading materials currently reported cannot withstand high temperatures and cannot be used in high temperature environments; natural melanin has poor dispersion in the oil phase and poor compatibility with lipophilic polymers; the mechanical properties of composite materials are poor, etc. Problem, a polyimide / modified natural melanin nanocomposite material and preparation method thereof are provided

Method used

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  • Polyimide/modified natural melanin nanocomposite and preparation method thereof
  • Polyimide/modified natural melanin nanocomposite and preparation method thereof
  • Polyimide/modified natural melanin nanocomposite and preparation method thereof

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preparation example Construction

[0028] The second aspect of the present invention provides the preparation method of above-mentioned polyimide / modified natural melanin nanocomposite material, and the steps include:

[0029] S1, extracting natural melanin nanoparticles;

[0030] S2. Surface modification of natural melanin: disperse natural melanin nanoparticles in an organic solvent, and when heated to 45-55°C, add APTES dropwise into the system, stir for 3-5 hours and centrifuge to obtain modified melanin nanoparticles. After washing Dry it, then ultrasonically disperse it in DMAC, let it stand for 10-14 hours, take the upper layer uniform solution, and obtain the modified melanin DMAC dispersion;

[0031] S3. Preparation of polyimide / modified natural melanin nanocomposite material: disperse the modified melanin DMAC dispersion in the polyimide DMAC solution, disperse evenly, and prepare the obtained uniform solution into a thin film.

[0032] In the above preparation method, the surface of the natural mela...

Embodiment 1

[0043] This embodiment provides a polyimide / modified natural melanin nanocomposite material, the polyimide in the nanocomposite material is connected with the natural melanin through a chemical bond, and the surface of the natural melanin is grafted with a silane coupling agent; The mass of the modified natural melanin is 0.1% of the mass of the polyimide, and the modified natural melanin is the natural melanin grafted with a silane coupling agent on the surface.

[0044] Further, the present embodiment provides a method for preparing the above-mentioned polyimide / modified natural melanin nanocomposite material, and the specific steps include:

[0045] (1) Extraction of natural melanin: Dissect the marine animal squid and take out the ink sac. Pour the powder in the ink sac into a small amount of deionized water, and repeatedly ultrasonically wash; and separate melanin nanoparticles by high-speed centrifugation (12000rpm, 20 minutes). After several times of washing, pure mela...

Embodiment 2

[0050] This embodiment provides a polyimide / modified natural melanin nanocomposite material, the polyimide in the nanocomposite material is connected with the natural melanin through a chemical bond, and the surface of the natural melanin is grafted with a silane coupling agent; The mass of the modified natural melanin is 0.5% of the mass of the polyimide, and the modified natural melanin is a natural melanin grafted with a silane coupling agent on the surface.

[0051] Further, this embodiment provides the preparation method of the above-mentioned polyimide / modified natural melanin nanocomposite material, the specific steps are basically the same as the steps of the preparation method of Example 1, the difference is:

[0052] (4) Preparation of polyimide / modified natural melanin nanocomposite material: take 0.5wt.% modified natural melanin of PI content, corresponding to 0.643g configured melanin DMAC solution, disperse in the DMAc solution of PI, ultrasonic Disperse for 15 m...

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Abstract

The invention provides a polyimide/modified natural melanin nanocomposite. Polyimide in the nanocomposite is connected with natural melanin through chemical bonds, and the natural melanin surface is grafted with a silane coupling agent. The invention further provides a preparation method of the nanocomposite. Natural melanin is subjected to surface modification with the silane coupling agent (APTES), and then the modified natural melanin and polyimide in different proportions are composited, and the nanocomposite is formed. A matrix of the polyimide/modified natural melanin nanocomposite does not degrade in a photocatalytic process and is resistant to strong ultraviolet radiation, so that the mechanical property and heat resistance are outstanding, and the service life is longer.

Description

technical field [0001] The invention relates to the technical field of chemical materials, in particular to a polyimide / modified natural melanin nanocomposite material and a preparation method thereof. Background technique [0002] The current ultraviolet light can be divided into three regions: UVC (220-280nm), UVB (280-320nm) and UVA (320-400nm). Short-wave high-energy ultraviolet rays can destroy covalent bonds, thereby degrading organic matter and shortening the service life of organic materials; at the same time, prolonged exposure to ultraviolet rays can also cause damage to human and animal bodies. Therefore, the development of ultraviolet shielding materials with certain transparency in the visible region has attracted long-term attention. As we all know, melanin is a multifunctional biological macromolecule widely present in the hair, skin, eyes and brain of animals; it has photoprotection, metal chelation, antibacterial activity, temperature regulation, free radic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08L89/00C08G73/10C08J5/18
Inventor 徐祖顺李庆廖光福张淑来童豪赵文哲
Owner HUBEI UNIV
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